XmlFile:test.xml
  PsiElement(XML_DOCUMENT)
    PsiElement(XML_PROLOG)
      <empty list>
    XmlTag:ns1:a
      XmlToken:XML_START_TAG_START('<')
      XmlToken:XML_NAME('ns1:a')
      XmlToken:XML_TAG_END('>')
      XmlTag:ns2:b
        XmlToken:XML_START_TAG_START('<')
        XmlToken:XML_NAME('ns2:b')
        XmlToken:XML_EMPTY_ELEMENT_END('/>')
      XmlToken:XML_END_TAG_START('</')
      XmlToken:XML_NAME('ns1:a')
      XmlToken:XML_TAG_END('>')